upstream-tanstack-query/docs/framework/angular/quick-start.md

id, title

id	title
quick-start	Quick Start

IMPORTANT: This library is currently in an experimental stage. This means that breaking changes will happen in minor AND patch releases. Upgrade carefully. If you use this in production while in experimental stage, please lock your version to a patch-level version to avoid unexpected breaking changes.

If you're looking for a fully functioning example, please have a look at our basic codesandbox example

Provide the client to your App

import { provideHttpClient } from '@angular/common/http'
import {
  provideTanStackQuery,
  QueryClient,
} from '@tanstack/angular-query-experimental'

bootstrapApplication(AppComponent, {
  providers: [provideHttpClient(), provideTanStackQuery(new QueryClient())],
})

or in a NgModule-based app

import { provideHttpClient } from '@angular/common/http'
import {
  provideTanStackQuery,
  QueryClient,
} from '@tanstack/angular-query-experimental'

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  providers: [provideTanStackQuery(new QueryClient())],
  bootstrap: [AppComponent],
})
export class AppModule {}

Component with query and mutation

import { Component, Injectable, inject } from '@angular/core'
import { HttpClient } from '@angular/common/http'
import { lastValueFrom } from 'rxjs'

import {
  injectMutation,
  injectQuery,
  QueryClient,
} from '@tanstack/angular-query-experimental'

@Component({
  template: `
    <div>
      <button (click)="onAddTodo()">Add Todo</button>

      <ul>
        @for (todo of todosQuery.data(); track todo.title) {
          <li>{{ todo.title }}</li>
        }
      </ul>
    </div>
  `,
})
export class TodosComponent {
  readonly todoService = inject(TodoService)
  readonly queryClient = inject(QueryClient)

  readonly todosQuery = injectQuery(() => ({
    queryKey: ['todos'],
    queryFn: () => this.todoService.getTodos(),
  }))

  readonly addTodoMutation = injectMutation(() => ({
    mutationFn: (todo: Todo) => this.todoService.addTodo(todo),
    onSuccess: () => {
      this.queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  }))

  onAddTodo() {
    this.addTodoMutation.mutate({
      id: Date.now().toString(),
      title: 'Do Laundry',
    })
  }
}

@Injectable({ providedIn: 'root' })
export class TodoService {
  private readonly http = inject(HttpClient)

  getTodos(): Promise<Todo[]> {
    return lastValueFrom(
      this.http.get<Todo[]>('https://jsonplaceholder.typicode.com/todos'),
    )
  }

  addTodo(todo: Todo): Promise<Todo> {
    return lastValueFrom(
      this.http.post<Todo>('https://jsonplaceholder.typicode.com/todos', todo),
    )
  }
}

interface Todo {
  id: string
  title: string
}